<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
    function  getInfo(member,year){
          member.name="css";
          year="1998";
    }
    var person={name:"html"};
    var birthYear="1997";
    getInfo(person,birthYear);
    console.log(person,birthYear);//css,1997
    </script>
</body>
</html>